126403890 has 16 divisors (see below), whose sum is σ = 303369408. Its totient is φ = 33707696.

The previous prime is 126403867. The next prime is 126403897. The reversal of 126403890 is 98304621.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (126403897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2106702 + ... + 2106761.

It is an arithmetic number, because the mean of its divisors is an integer number (18960588).

Almost surely, 2^126403890 is an apocalyptic number.

126403890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

126403890 is an abundant number, since it is smaller than the sum of its proper divisors (176965518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

126403890 is a wasteful number, since it uses less digits than its factorization.

126403890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4213473.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 126403890 is about 11242.9484566994. The cubic root of 126403890 is about 501.8648890633.

The spelling of 126403890 in words is "one hundred twenty-six million, four hundred three thousand, eight hundred ninety".